Round to Thousandth Calculator Round to 3 decimal places. Number Rounded 3.142 Step-by-step with your numbers: 1. Values used: 2. Number = 3.142 3. Rounded = 3.142 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! 3 decimal places. FAQ Sig figs? This is decimal places, not sig figs. Related calculators Rounding Calculator Round a number to a chosen number of decimals. Significant Figures Calculator Round a number to a number of significant figures.